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per lb. How much change out of £l should the pur. chaser receive ?

(38.) Find the difference between the discount allowed at 5 per cent. on £812 paid 3 months before it is due, and the interest charged for the loan of the same sum for the same period at the same rate.

(39.) If 25 men can do a piece of work in 12 days, working 10 hours each day, how many hours a day must 27 boys work in order to complete the same in 36 days, the hour's work of a boy being half that of a

(40.) If a family of nine people can live comfortably in Switzerland for 1000 guineas a year, what should it have cost seven of them for five weeks in Paris, during the Exhibition, supposing prices to be 21 times what they are in Switzerland ?

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CHAMBERS'S EDUCATIONAL COURSE-continued.

History. Ancient History,

2 6 Medieval History,

3 0 Modern History,

3 6 History of Ancient Greece, .

2 6 History of Rome,

2 History of the British Empire,

2 0 Questions and Answers on British History,

1 0 Exemplary and Instructive Biography,

2 0 Historical Questions, with Answers,

2 6 Historical and Miscellaneous Questions, with Answers,

Arithmetic and Mathematics. Arithmetic, Introduction to,

1 0 Advanced Treatise, Key to,

2 0 Book-Keeping by Single and Double Entry (New Edition), 1 6 by Single Entry (New Edition),

1 0 two Ruled Paper

Books for Single Entry, sewed, 1 3 two Ruled Paper Books for Double Entry, do. 1 3 Questions in Book-keeping, with Answers,

1 6 Farm Book-keeping,

1 0 Algebra, Theoretical and Practical,

3 0 , Key to,

2 6 Exercises and Problems in Algebra, with Answers,

2 without Answers,

1 0 Plane Geometry,

1

2 The Explicit Euclid,

2 0 Key to,

2 Euclid's Propositions, in a series of 20 sheets,

each 2 Geometrical Chart-measuring 3 ft. 4 in by 2 ft. 4 in., 2 6 Solid and Spherical Geometry,

1 6 Practical Mathematics,

4 6 Key to,

3 6 Mathematical Tables (New Edition), .

3 6 Science, Introduction to the Sciences,

1 0 Laws of Matter and Motion,

10 Mechanics,

1 0 Hydrostatics, Hydraulics, and Pneumatics,

10 Acoustics, Optics, Astronomy, Electricity, Meteorology, each 1 0 Natural Philosophy, Vol. L-Matter and Motion, &c., 3 0 Vol. II.-Optics, Astronomy, &c., ..

3 0 SCIENTIFIC CHẢRTS-each Chart measuring 40 by 27

inches, and containing upwards of 20 pictorial illustrations. Sheet 1. Laws of Matter and Motion,

1 6 2. Mechanics,

1 6 3. Do. Each sheet mounted on rollers,

4 6 mounted and varnished,

5 6

Key to,

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CHAMBERS'S EDUCATIONAL COURSE-continued.

Science-continued. Practical Chemistry, by Dr S. Macadam (Ner Edition), 2 6 Inorganic Chemistry, by Professor Wilson (New Edition), 3 6 Zoology,

2 6 Animal Physiology,

1 6 Vegetable Physiology,

1 6 Political Economy,

1 6 Miscellaneous Questions, with Answers,

2 6 Electricity, by Dr Ferguson,

3 6 Navigation,

7 6 Latin. Ruddiman's Latin Rudiments,

10 Latin Grammar, Elementary New Edition),

2 0 Advanced

4 0 Latin Exercises, Elementary,

1 Advanced,

2 6 Key to Advanced Latin Exercises,

2 0 Phædrus's Fables,

1 6 Nepos,

2 0 Cæsar (New Edition),

2 6 Sallust,

1 6 Quintus Curtius,

3 0 Ovid,

3 0 Horace, Virgil' Vol

. I.: Bucolics, and Æneid I. to VI.,

Vol. II. : Æneid VII. to XII., and Georgics, Livy,

3 Latin Dictionary, Latin and English,

6 0 Latin-English Part-English-Latin Part, each 3 6

German. First German Reading Book,

1 6 Second German Reading Book,

2 6 German Grammar, Elementary,

1 6 Advanced,

3 0 English German Phrase Book,

1 6 German Dictionary, German and English,

7 German-English Part,

4 0 English-German Part, .

4 0 Dictionary of German Synonyms,

1 6 Minor Educational Course.

For Use in the Humbler Class of Schonde 1. Introduction to Reading, 2. Reading Lessons, 3. Arithmetical Primer,

Key to do., 4. Grammatical Primer, 5. Outlines of Geography, 6. History,

Or in one Vol. (Key excepa

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